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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04eb123a24d0b1e1b769ad94d8fc925538a4cdb5ef4b88fdeba8ac0cdc801fb7' 
  AND token = '2Cjuzr6icxnm4qnkuGazIW2VpQKyrg51I5Sq5rEdafU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}